Improving CH4 production and energy conversion from CO2 and H2 feedstock gases with mixed methanogenic community over Fe nanoparticles

2020 ◽  
Vol 314 ◽  
pp. 123799
Author(s):  
Jun Cheng ◽  
Haiquan Dong ◽  
Haihua Zhang ◽  
Luyun Yuan ◽  
Hui Li ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Methanogenic Community ◽  
Ch4 Production ◽  
Fe Nanoparticles

Ultrafine Fe nanoparticles embedded in N-doped carbon nanotubes derived from highly dispersed g-C3N4 nanofibers for oxygen reduction reaction

2021 ◽  
Author(s):  
Yue Ran ◽  
Li Quan ◽  
Jiayi Cui ◽  
Jianqiao Liu ◽  
Wei Lin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Oxygen Reduction Reaction ◽  
Energy Conversion ◽  
Oxygen Reduction ◽  
Noble Metal ◽  
Carbon Nitride ◽  
Reduction Reaction ◽  
Fe Nanoparticles ◽  
Highly Dispersed ◽  
Energy Conversion Devices

Exploring non-noble-metal electrocatalyst is vital and challenging for promoting the oxygen reduction reaction (ORR) in energy conversion devices. In this work, hydrolyzed graphitic carbon nitride (h-CN) wrapped Fe nanoparticles with...

Effect of different forage types and concentrate levels on energy conversion, enteric methane production, and animal performance of Holstein × Zebu heifers

2017 ◽  
Vol 57 (10) ◽  
pp. 2042 ◽  
Author(s):  
F. A. S. Silva ◽  
S. C. Valadares Filho ◽  
E. Detmann ◽  
S. A. Santos ◽  
L. A. Godoi ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Average Daily Gain ◽  
Mean Value ◽  
Animal Performance ◽  
Evaluation Systems ◽  
Ch4 Emissions ◽  
Ch4 Production ◽  
Baseline Group ◽  
Enteric Methane ◽  
The Mean

The aim of this study was to evaluate the effect of diets containing corn silage (CS) or sugarcane (SC) with 300 or 500 g/kg of concentrate (on a DM basis) on energy conversion, enteric methane (CH4) production, and the animal performance of Holstein × Zebu heifers. An experiment was conducted while using comparative slaughter. Twenty Holstein × Zebu heifers with an average age of 12 ± 1.0 months and an average bodyweight of 218 ± 36.5 kg were used. Four heifers were assigned to a baseline group, whereas the remaining 16 heifers were distributed in a completely randomised design using a 2 × 2 factorial scheme (n = 4), with two types of roughage (CS or SC) and two levels of concentrate (300 or 500 g/kg) on a DM basis of the diet over the course of 112 days. For the evaluation of the apparent total-tract digestibility of diets and energy losses, a digestibility assay was performed by using the total collection of faeces and urine over three consecutive days. The enteric CH4 production was quantified by continuous analysis of regular samples of air excreted by the animals throughout the day. The greatest (P < 0.05) average daily gain was observed for heifers that were fed CS-based diets or with 500 g/kg of concentrate. Greater (P < 0.05) daily CH4 emissions were observed for heifers that were fed 500 g/kg of concentrate; CH4 production as a function of DM intake was greater (P < 0.05) for heifers that were fed SC-based diets. The efficiency of the conversion from digestible energy (DE) to metabolisable energy (ME) was not influenced (P > 0.05) by variables that were analysed in this study. However, the mean value that was observed in the present study was above those values proposed by the main evaluation systems of feedstuffs and nutrient requirements of ruminants. Therefore, we concluded that CS-based diets allow for better animal performance of Holstein × Zebu heifers in relation to SC-based diets. Also, the increased concentrate improves the performance of growing heifers. A greater inclusion of concentrate in SC-based diets can allow for a reduction of CH4 emissions per consumed unit and per gain unit. The mean suggested value for the ME : DE ratio based on this study is 0.86. However, more studies are necessary to validate this result.

Artificial cells containing sustainable energy conversion engines

2019 ◽  
Vol 3 (5) ◽  
pp. 573-578 ◽  
Author(s):  
Kwanwoo Shin
Keyword(s):  
Energy Conversion ◽  
Nicotinamide Adenine Dinucleotide ◽  
Sustainable Energy ◽  
Living Cells ◽  
Energy Transduction ◽  
Artificial Cells ◽  
Energy Conversion Process ◽  
Metabolic Reactions ◽  
Metabolic Activities ◽  
Reduced Nicotinamide Adenine Dinucleotide

Living cells naturally maintain a variety of metabolic reactions via energy conversion mechanisms that are coupled to proton transfer across cell membranes, thereby producing energy-rich compounds. Until now, researchers have been unable to maintain continuous biochemical reactions in artificially engineered cells, mainly due to the lack of mechanisms that generate energy-rich resources, such as adenosine triphosphate (ATP) and reduced nicotinamide adenine dinucleotide (NADH). If these metabolic activities in artificial cells are to be sustained, reliable energy transduction strategies must be realized. In this perspective, this article discusses the development of an artificially engineered cell containing a sustainable energy conversion process.

Sign in / Sign up

Export Citation Format

Share Document